Pension & Postretirement Expenses (Tables)

6 Months Ended

Mar. 31, 2018

Defined Benefit Plan [Abstract]

Summary of Pension and Postretirement Plan Expenses

Total periodic pension and postretirement expense is summarized below:

	Three Months Ended March 31,						Six Months Ended March 31,
		2017			2018			2017		2018
Service cost		$	21		19			42		38
Interest cost		42			47			84		93
Expected return on plan assets		(86		)	(88	)		(172	)	(175	)
Net amortization		53			30			106		61
Total		$	30		8			60		17